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Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance for Loan Losses and the Recorded Investment of Loans Based On Impairment Method - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Ending allowance balance attributable to loans:        
Individually evaluated for impairment $ 2,164 $ 3,412    
Collectively evaluated for impairment 4,484 4,922    
Total ending allowance balance 6,648 8,334 $ 6,155 $ 6,905
Loans:        
Loans individually evaluated for impairment 17,228 20,169    
Loans collectively evaluated for impairment 568,524 574,599    
Total ending loans balance 585,752 594,768    
Residential Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Collectively evaluated for impairment 1,087 1,426    
Total ending allowance balance 1,087 1,426 1,169 1,329
Loans:        
Loans individually evaluated for impairment 1,001 1,415    
Loans collectively evaluated for impairment 222,874 222,213    
Total ending loans balance 223,875 223,628    
Commercial Real Estate Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 311 2,506    
Collectively evaluated for impairment 1,648 1,689    
Total ending allowance balance 1,959 4,195 2,914 3,946
Loans:        
Loans individually evaluated for impairment 7,318 11,711    
Loans collectively evaluated for impairment 161,994 165,901    
Total ending loans balance 169,312 177,612    
Commercial Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 1,850 900    
Collectively evaluated for impairment 739 702    
Total ending allowance balance 2,589 1,602 1,279 783
Loans:        
Loans individually evaluated for impairment 8,691 6,824    
Loans collectively evaluated for impairment 73,245 77,174    
Total ending loans balance 81,936 83,998    
Consumer Portfolio Segment [Member]        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 3 6    
Collectively evaluated for impairment 1,010 1,105    
Total ending allowance balance 1,013 1,111 $ 793 $ 847
Loans:        
Loans individually evaluated for impairment 218 219    
Loans collectively evaluated for impairment 110,411 109,311    
Total ending loans balance $ 110,629 $ 109,530